| 年度 | 实际值 |
|---|---|
| 1995 | 46.4 |
| 1996 | 44.8 |
| 1997 | 20.96 |
| 1998 | 45.8 |
| 1999 | 45.6 |
| 2000 | 43.9 |
| 2001 | 41.93 |
| 2002 | 41.79 |
| 2003 | 44.93 |
| 2004 | 44.37 |
| 2005 | 38.87 |
| 2006 | 40.42 |
| 2007 | 43.21 |
| 2008 | 46.99 |
| 2009 | |
| 2010 | 50.26 |
| 2011 | 48.97 |
| 2012 | 50.5 |
| 2013 | 50.66 |
| 2014 | 57.02 |
| 2015 | 58.39 |
| 2016 | 59.72 |
| 2017 | 61.99 |
| 2018 | 58.89 |